Okkervil River don’t have to sound right on the precipice of madness to be interesting, but unfortunately The Silver Gymnasium buffs away their eccentricities and robs the music of its impact. They aim for jittery energy on “Walking Without Frankie”, but it sounds inert. They shoot for triumphal on “On a Balcony”, but there’s no heft to those backing vocals. They reach for tattered majesty on closer “Black Nemo”, but they never hoist the flag quite high enough.